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We present the discovery of two giant planets orbiting stars in Praesepe(also known as the Beehive Cluster). These are the first known hot Jupiters inan open cluster and the only planets known to orbit Sun-like, main-sequencestars in a cluster. The planets are detected from Doppler shifted radialvelocities; line bisector spans and activity indices show no correlation withorbital phase, confirming the variations are caused by planetary companions.Pr0201b orbits a V=10.52 late F dwarf with a period of 4.4264 +/- 0.0070 daysand has a minimum mass of 0.540 +/- 0.039 Mjup, and Pr0211b orbits a V=12.06late G dwarf with a period of 2.1451 +/- 0.0012 days and has a minimum mass of1.844 +/- 0.064 Mjup. The detection of 2 planets among 53 single memberssurveyed establishes a lower limit on the hot Jupiter frequency of 3.8(+5.0)(-2.4) % in this metal-rich open cluster. Given the precisely known ageof the cluster, this discovery also demonstrates that, in at least 2 cases,giant planet migration occurred within 600 Myr after formation. As we endeavorto learn more about the frequency and formation history of planets,environments with well-determined properties -- such as open clusters likePraesepe -- may provide essential clues to this end.

Two 'b's in the Beehive: The Discovery of the First Hot Jupiters in an Open Cluster